About NSRRC / Organization

Light Source Division > Beam Dynamics Group

The mission of beam dynamics group

  1. Accelerator design and performance upgrade
  2. Troubleshooting and analysis of operational problems
  3. Development of application programs for accelerator physics
  4. R&D of novel accelerator-based light sources
  5. Accelerators for industrial/medical applications
Double mini-betay lattice in TPS

The baseline lattice of TPS storage ring consists of 24 double bend achromat (DBA) cells, 18 short straight sections (7m) and 6 long straight sections (12m). Based on the baseline lattice, three long straight sections are symmetrically configured as double mini-betay lattice in which three sets of quadrupole triplet are installed in the middles of three long straight sections respectively to accommodate two undulators as shown in Fig. 1.
The current lattice of user operation is a double mini-betay lattice with 3 superperiods, different from the baseline lattice used during the TPS commissioning. Figure 2 shows the beam optics functions for the TPS double mini-betay lattice of one superperiod.
Table 1: The accelerator parameters for the double mini-betay lattice
Accelerator parameter Storage Ring
Energy (GeV) 3.0
Current (mA) 400 (500)
Circumference (m) 518.4
Nature emittance (nm-rad) 1.6
Bending radius (m) 8.40338
Betatron tune 26.16 / 14.24
Energy loss per turn (keV) 853
Natural energy spread 8.86 x 10-4
Bunch length (mm) 2.86
Harmonic number 864
RF frequency (MHz) 499.654

Figure 1: Schematic layout of the TPS storage ring and the locations of insertion devices.
Figure 2: Beam optics function for the double mini-betay lattice of one superperiod in the TPS storage ring.
English NameJob Responsibilities
Ping-Jung Chou*
  • Collective instabilities
  • Beam diagnostics
  • Lattice design
  • Accelerators for industrial/medical applications
Gwo-Huei Luo
  • Research and development on accelerator physics and technology
  • Accelerator for medical and industrial applications
Hung-Jen Tsai
  • Lattice design
  • Beam optics correction
  • Application programs for accelerator physics
Mau-Sen Chiu
  • Lattice design
  • Nonlinear beam dynamics
  • Beam dynamics related insertion devices
  • Application programs for accelerator physics
Fan-Hsin Tseng
  • Application programs for accelerator physics
  • Beam optics correction
Jia-Ye Chen
  • Beam diagnostics
  • Collective instabilities
  • R&D of novel accelerator-based light sources
* Group Leader